According to circuit principle of the experiment of measuring magnetic field in straight solenoid by impact galvanometer, theory analysis on reducing system error is done by using numerical method.

根据冲击电流计测直螺线管磁场的实验电路原理，利用数值计算方法，对减少测量的系统误差进行了理论分析。

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It is proved by analysis and experiment that the main harmonics is suppressed. The system has features of simple hardware circuit, good reliability, strong anti-interference ability and so on.

分析和实验表明，主要谐波得到抑制、系统可靠性好且抗干扰能力强。

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